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Module II: Browser & Apache Web Server Architecture; Common Protocols

20202m

What does error 404 or Not Found error while accessing a URL mean?

(i) The server could not find the requested URL
(ii) Requested HTML file is not available
(iii) The path to the interpreter of the script is not valid
(iv) The requested HTML file does not have sufficient permissions

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Correct Answer: (i) The server could not find the requested URL

Explanation:

  • The HTTP 404 Not Found status code is a standard client-side error response indicating that the origin web server successfully received the client's request, but could not locate the requested resource (URL/endpoint) on the server.
  • Common causes: Broken/dead links, mistyped URL paths, deleted pages, or missing URL rewrite routing rules.

Other Related HTTP Status Codes:

  • 401 Unauthorized / 403 Forbidden: The user lacks sufficient permissions to access the resource.
  • 500 Internal Server Error: The server encountered an unexpected error or script interpreter failure.
  • 502 Bad Gateway: An upstream server failed to respond properly.

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